Nozzle for paint spraying



Juiy al, 1924; 1,500,384

R. J. HAGERMAN NOZZLE FOR PAINT SPRAYING Filed Abril 25 1922 i ,49 vaverftar i y@ l,

Patented July 8, 1924.

RALPH J'. HAGERMAN, 0F CEDAR RAPIDS, IOWA.

NOZZLE FOR PAINT SPRAYING.

Application led April 25, 1922.

To all whom it 'may concern.'

Be it known that I, RALPH J. HAGERMAN, a citizen of the United States, and resident of Cedar Rapids, in the county of Linn and State of Iowa, have invented a certain new and useful Nozzle for Paint Spraying, of which the following is a specification.

The object of my invention is to provide a nozzle of simple, durable and inexpensive construction, especially adapted for use'in spraying paint or the likev and whereby the nozzle may be readily, quickly and easily adjusted to spray material such as paint, when delivered to the discharge end of the nozzle under pressure, both when the material is relatively thick or relatively thin, and further in this connection it is my object to provide anozzle of this class which will not be readily obstructed and the flow stopped because of the presence of relative large bodies of solid material contained in the paint. A further object is to provide a nozzle of this character in which the parts may be readily, quickly and easily removed and replaced for cleaning, and which will not permit the leakage of paint through the sides of the nozzle at the point where the adjust ment is made.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in the accompanying drawings, in which:

Figure 1 shows a central longitudinal sectional view of a nozzle embodying my invention. The arrows indicate the path of travel of the paint material through the nozzle.

Figure 2 shows a detail side view of the slotted partition.

Figure 3 shows an isometrical view of the several parts of the nozzle detached, and

Figure 4 shows a side elevation of the discharge end of the nozzle. The arrows indicate the path of travel of the material when the diameter of the discharge opening is greatly reduced.

Referring to the accompanying drawings, I have used the reference numeral 10 to indicate the nozzle body. It is provided at its one end with an internally screwthreaded opening 11 and at its central por tion with a reduced cylindrical opening at Serial No. 556,501.

12, and an annular shoulder at 13. At the discharge end of the nozzle body there is an enlarged internally screw-threaded openingl 14. Arranged within the screwthreaded opening 11 is the slotted partition 14a, which partition has on opposite sides of its center slots or openings 15 arranged at an angle of approximately forty-tive degrees relative to a line drawn through the longitudinal center of the nozzle. This partition is preferably provided on one side with a slot 16 adapted to receive a screw driver by which it may be removed or adjusted.

Mounted in the cylindrical opening 12 is the adjustable discharge member 17 which is made of a single piece of yielding material, such as brass, and is of cylindrical form, its discharge end being tapered toward a longitudinal central line. In its sides are formed a series of slots 18 thus forming at the discharge end a series of inwardly curved arms which when pressed together form a reduced discharge opening, and when relieved of pressure the springing arms will moveoutwardly to form a relatively large discharge opening.

The nozzle cap comprises a body portion 19 having an external screw thread fitted into the screw-threaded portion 14, and having a round ydischarge opening 21 at its central portion. @n the interior of the nozzle cap at the rear there is a rounded opening 2O and between the openings 2O and 21 there is an inclined wall 22, for purposes hereinafter made clear. A flexible washer 23 is provided'between the cap and the adjacent end of the nozzle body 10.

In practical operation and assuming that the device is assembled, as shown in Figure 1, and that the nozzle is attached to a hose through which paint or the like is discharged under pressure, then as the paint passes through the slotted partition and into the interior' of the adjustable discharge member it would be given a rapidly rotating spiral motion and this motion will be maintained as it travels through the adjustable discharge member because the interior thereof is relatively large and the relatively large body of paint admitted therein will retain its rotary motion.

When the body of paint reaches the discharge end it will pass through the discharge opening 21 and the particles of paint will be given a tangential divergent motion resulting in a spray having relatively wide distribution and further resulting in thoroughly separating the paint into relatively fine particles.

When it is desired to reduce the quantities of paint being discharged, the operator simply adjusts the nozzle cap, whereupon lthe inclined surface 2O thereof bears upon the curved ends of the arms of the discharge nozzle and moves them together forming a smaller substantially circular opening at the discharge end of the adjustable discharge member 17, and when this is done the particles of paint will be given a tangential divergent movement, as illustrated by the arrows in Figure 4t, and this movement will not be prevented or obstructed by the opening 2l in the nozzle cap.

The washer 23 will prevent the passage of any paint between the adjacent screwthreaded portions and this is true even when the nozzle cap is moved from its position for making a line small stream to its position for making a large stream as the rotary movement of the cap is relatively slight and the washer may be kept under pressure throughout this entire movement so that no leakage will occur at this point.

Heretofore spraying nozzles have been provided with a device to be placed in the `center of the liquid material passing to the dischar e end and when such devices have been a justed fine enough to be practical for use in paint spraying it has been found that they clog up quite frequently on account of large particles of paint or foreign matter in the paint. Hence at the present time it is the practice in connection with the use of paint spraying nozzles for the operator to carry several nozzles and as the condition of the paint varies from relatively thin to relatively thick the nozzle with the small opening is removed and a nozzle with a larger opening is substituted. This practice of replacing and removing nozzles or of stopping to clean out adjustable nozzles having adjusting devices in the center of the current of paint is very wasteful of the operators time. Furthermore, in the art of spraying paint and on account of the rapidly changing conditions of the paint, it is necessaryL 1n order to get the best results to frequently adjust the size of the discharge opening anduthis adjustment must be capable of minute changes. i Y

Vith my improved nozzle a relatively large body of paint is given a rotary motion shortly after it enters the nozzle and on account of the large size of this body the r0- tary motion is readily maintained. Then when the whirling paint reaches the discharge end of the adjustable discharge member the sectional area of the stream of paint being discharged is reduced and thrown' outwardly through the opening in the nozzle cap, and the particles of paint are given a tangential divergent motion as they leave the opening of the nozzle cap causing a widespread space of finely reduced particles of paint.

If changes occur in the condition of the paint being delivered to the nozzle or if the nature of the work being done demands it, a slight adjustment of the nozzle cap will produce the desired result and the articles of paint will be given just as wide istribution and the particles just as finely reduced when there is a relatively large flow of paint as they will be when there is a relatively,` re'-V duced iiow of paint.

In addition to the use of my improved spraying nozzle for applying paint, I have found it beneficial and useful in sprayin insecticide on trees, shrubbery and plants an I do not wish to be understood as in' an way limiting the use of my `improved nozze for any specific liquid.

I claim as my invention:

A spraying nozzle comprising a nozzle body having a central passageway through it, and a reduced opening at the discharge end, a hollow adjustable current regulating member through which liquid lowin through the nozzle may pass and provide with a reduced portion atv its discharge end, means for adjusting the size of the fassa e way through said reduced end, an( a disk having diagonal slots extended through it for imparting a whirling motion to the liquid, said disk being located `in the nozzleV between the current regulating member and the receiving end of the nozzle.

Des Moines, Iowa, March 16, 1922.

RALPH J. HAGERMAN. 

